Hey guys! We found one of our male pekin ducks today outside and I noticed this black spot on the back of his body. When my husband picked him up and I was able to pull feathers back, he has a huge sore that's black and can see some infected skin. I don't want the poor guy to suffer, what's the best way to treat it? We don't have a wildlife vet here so I can't take it anywhere. Please help my guy!